The Habit Burger Grill

This west coast-based chain has made quite a name for itself in California and Arizona but has yet to expand east.

The Habit Burger Grill is best known for its smokey flavored charbroiled burgers, friendly service, and, more recently, for its sleek black Habit Truck that die-hard fans can rent out for parties and events.

Fatburger

The Beverly Hills burger chain was founded in 1947, but didn't start its rapid expansion until a decade ago.

All burgers are made-to-order with fresh ingredients. Customers can order portion sizes ranging from "small" (a single patty) to "XXXL" (three giant patties with cheese).

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Smashburger

Kim Bhasin / Business Insider

Number of US restaurants in 2013: 240

% change from previous year: 29%

Smashburger was founded in 2007 by the guy who thought up the stuffed crust pizza and McGriddles, Tom Ryan.

It was originally named IconBurger, but the management team eventually changed the name to more appropriately describe how they actually create their burgers — smashing them into a grill with a metal plate.